急斜特厚煤层残留煤柱稳定性分析及其动力灾害防治  

Stability analysis and dynamic disasters prevention of residual coal pillar in steeply inclined and extremely thick coal seam

作　　者：李云鹏 崔峰[2,3] 杨文化[2,3] 尉迟小骞 LI Yunpeng;CUI Feng;YANG Wenhua;YUCHI Xiaoqian(Department of Resources and Civil Engineering,Yantai Gold College,Yantai 265401,China;College of Energy Science and Engineering,Xi’an University of Science and Technology,Xi’an 710054,China;Key Laboratory of Western Mine Exploitation and Hazard Prevention,Ministry of Education,Xi’an University of Science and Technology,Xi’an 710054,China)

机构地区：[1]烟台黄金职业学院资源与土木工程系,山东烟台265401 [2]西安科技大学能源学院,陕西西安710054 [3]西安科技大学西部矿井开采及灾害防治教育部重点实验室,陕西西安710054

出　　处：《西安科技大学学报》2021年第4期657-664,共8页Journal of Xi’an University of Science and Technology

基　　金：国家自然科学基金资助项目(51874231,51504184)。

摘　　要：为研究急斜特厚煤层开采过程中残留煤柱的稳定性及其应力异常区引起的回采安全问题,以乌鲁木齐矿区乌东煤矿南采区87°急斜特厚煤层为研究背景,运用块体理论构建了残留煤柱滑移失稳力学模型,采用FLAC 3D数值模拟软件分析开采扰动下残留煤柱的应力演化特征,提出了残留煤柱分段深孔爆破弱化的卸压措施。结果表明:当煤层倾角α,顶板侧围岩与残留煤柱的摩擦系数μ1,底板侧围岩与残留煤柱的摩擦系数μ2之间满足α>arctan(μ1+μ2)时,残留煤柱将发生滑移失稳;残留煤柱易使顶底板应力状态改变,在开采扰动和顶底板高应力双重作用下,残留煤柱极易诱发动力灾害;卸压措施有效削减残留煤柱内部储存的应力强度,降低动力灾害的发生频率,实现工作面安全通过煤柱危险区域。In order to study the stability of residual coal pillars and the safety problems caused by abnormal stress areas during the mining of steep and extra-thick coal seams,this paper takes the 87°steep extra thick coal seam,which was in the south mining area of Wudong coal mine in Urumqi mining area,as the research objects.The mechanical model is constructed of sliding instability of residual coal pillar using the block theory,and then the stress evolution characteristics are analyzed of the residual coal pillar during the mining disturbance adapting FLAC 3D numerical simulation software.The suggestion is made to use the segmentation of residual coal pillar to pressure relief measures for weakening of deep hole blasting.The results show that when the dip angle of coal seamα,friction coefficient between surrounding rock on roof side and residual coal pillarμ1,friction coefficient between surrounding rock and residual coal pillar at floor sideμ2,meet withα>arctan(μ1+μ2),the residual coal pillar will slide and lose stability;residual coal pillar is easy to change the stress state of roof and floor,so under the dual action of mining disturbance and high stress of roof and floor,residual coal pillar tends to induce dynamic disaster;pressure relief measures effectively reduce the internal storage of residual coal pillar.The stress intensity reduces the frequency of dynamic disasters and ensures the safety of working face passing through the dangerous area of coal pillar.

关 键 词：急斜特厚煤层 残留煤柱 力学模型 动力灾害 

分 类 号：TD353[矿业工程—矿井建设]